Scilab Function
Last update : 12/1/2004

cls2dls - bilinear transform

### Calling Sequence

  `[sl1]=cls2dls(sl,T [,fp])`

### Parameters

- `sl,sl1`: linear systems (`syslin` lists)
- `T`: real number, the sampling period
- `fp`: prevarping frequency in hertz

### Description

given `sl=[A,B,C,D]` (`syslin` list),a continuous time system `cls2dls` returns the sampled system obtained by the bilinear transform `s=(2/T)*(z-1)/(z+1)`.

### Examples

    s=poly(0,'s');z=poly(0,'z');
    sl=syslin('c',(s+1)/(s^2-5*s+2));  //Continuous-time system in transfer form
    slss=tf2ss(sl);  //Now in state-space form
    sl1=cls2dls(slss,0.2);  //sl1= output of cls2dls
    sl1t=ss2tf(sl1) // Converts in transfer form
    sl2=horner(sl,(2/0.2)*(z-1)/(z+1))   //Compare sl2 and sl1

### See Also

`horner`,